Only enforce the strongest SettingsEnforcement group in the absence of a Finch config on Windows.

chrome/browser/prefs/chrome_pref_service_factory.cc

Index: chrome/browser/prefs/chrome_pref_service_factory.cc
diff --git a/chrome/browser/prefs/chrome_pref_service_factory.cc b/chrome/browser/prefs/chrome_pref_service_factory.cc
index 97313af949c6e5128f12ef5f5348c1809dd7fd7f..eaa2761a3c9eab068cad6ea71d65acb22358d5c0 100644
--- a/chrome/browser/prefs/chrome_pref_service_factory.cc
+++ b/chrome/browser/prefs/chrome_pref_service_factory.cc
@@ -204,8 +204,14 @@ SettingsEnforcementGroup GetSettingsEnforcementGroup() {
   };
 
   // Use the strongest enforcement setting in the absence of a field trial
-  // config.
-  SettingsEnforcementGroup enforcement_group = GROUP_ENFORCE_DEFAULT;
+  // config on Windows.
+  // TODO(gab): Enforce this on all platforms.
+  SettingsEnforcementGroup enforcement_group =
+#if defined(OS_WIN)
+      GROUP_ENFORCE_DEFAULT;
+#else
+      GROUP_NO_ENFORCEMENT;
+#endif
   bool group_determined_from_trial = false;
   base::FieldTrial* trial =
       base::FieldTrialList::Find(